38 INTERRELATIONS OF PLANTS AND ANIMALS 



d. Adult or Imago 



Method. — Examine carefully an adult Initterfly or moth. 

 Observations. — How many body regions has it? How many 

 legs ? Wings ? Antennae ? 



How does this stage differ from the pupal stage? 



Note. — All the changes undergone by an animal from the time it leaves the 

 egg to the time it becomes an adult are known as the stages of metamorphosis of 

 that animal. If no great changes in form occur, then the animal is said to have 

 an incomplete or direct metamorphosis. But if changes in form such as we have 

 just seen occur, then the animal is said to pass through a complete or indirect 

 metamorphosis. 



Conclusion. — 1. What insects that you have studied pass 

 through a direct metamorphosis? An indirect metamorphosis? 



2. If time permits, drawings might be made to illustrate the life 

 history (metamorphosis) of a moth or a butterfly. 



Problem 12: To learn the structure and worh of the parts of 

 a flower. 



Materials. — Any large flower, as the tulip in the spring, or eve- 

 ning primrose or gladiolus in the fall. 



Method. — Carefully examine the parts of a flower. 



Note. — Flowers are built so that the parts are arranged in circles. In regular 

 flowers the same number of parts (or multiples of these parts) will be found in each 

 circle. 



Observations.^ — How many parts in the outermost circle? 

 These parts are called sepals. Collectively they make up the 

 calyx. What color have the sepals? In a young flower what 

 seems to be their use ? 



The next circle of parts is called the petals. How many are 

 there? What color do they have? Together they form the 

 corolla. 



The little knobbed organs are called stamens; the stalk is the 

 filament, the knob the anther. Describe what you find in the 

 anthers. This is the pollen. Can you determine how it gets out 

 of the anthers? Use a hand lens. 



In the center of the flower is the pistil.^ Describe it. The 



1 If the pistil is made up of a number of separate parts, each part is called a carpel. 



